MAHLE ACX380, Service Manual

Page: 17 / 45

| ACX380/480 | 17
en
© MAHLE
9.5 Calibration check
The refrigerant gas weight scale is calibrated with a 3 points
procedure during manufacturing and it is possible to replace
calibration, only if the service technician carry out a new
refrigerant gas weight calibration with the 3 points procedure
mentioned on chapter 9.4.
With every “calibration check” the scale receive a fine
adjustment with calculation of a coefficient to adjust the
measure (without to clear the 3 points calibration).
This procedure is only an adjustment, not a complete “gas
weight calibration” (mentioned at chapter 9.4)
The function needs a certified reference weight (≥100g and
≤ 10000g) to place on the vessel support when requested by
software
(the certified reference weight is not included in the
A/C service unit scope of delivery or in the service kit);
(Certified reference weight)
From the SECURED SERVICE menu, (insert the password
“DEBUG”), select “Calibration check” and press ENTER ( ).
When the question “Clear previous calibration?” will appear
selecting YES ( ) to erase the previous calibration adjustment
and start procedure. Follow step by step the procedure to
place and remove the certified reference weight as required by
software.
POSSIBLE RESULTS OF THE CALIBRATION CHECK:
1. POSITIVE - If the current value measured by scale is
around the value of the certified reference weight
the result is positive, confirm to update calibration
updating the corrective coefficient.
2.
NEGATIVE - “update calibration?”. If the current
value measured by scale is not around, but at the
same time, not too far from the reference value of the
certified reference weight, the result is negative and
the software asks to “update calibration”, confirm it
to update corrective coefficient.
3.
NEGATIVE . If the current value measured by scale
is too far from the value of the certified reference
weight the result is negative, in this case is not
possible to “update calibration”. It is necessary to
carry out the 3 points “Gas weight calibration”
(mentioned at chapter 9.4).
9.6 Oil weight calibration
From the SECURED SERVICE menu, (insert the password “DEBUG”),
select the OIL WEIGHT CALIBRATION.
Remove the exhausted oil container from the equipment and press
”OK”
to acquire the signal zero of the load cell.
•
Insert a reference weight (200g – 400g) in the new oil (PAG)
fitting and set its value.
•
Insert a reference weight (200g – 400g) in the new oil (POE)
fitting and set its value.
•
Insert a reference weight (200g – 400g) in the used oil fitting
and set its value.
•
Insert a reference weight (200g – 400g) in the UV Dye fitting
set and set its value..
Fig. 19: Reference weight insertion
Remove the oil sample weights and insert the empty containers and
procede.
When required by the guided procedure, confirm the calibration.
9.7 Compressor and vacuum pump test
From the SECURED SERVICE menu, (insert the password “DEBUG”),
Select the “Compressor and vacuum pump test”
Disconnect the LP and HP quick couplers from any A/C system and
press enter OK.
Follow the instruction on the screen (the function firstly will test the
compressor and then the vacuum pump performances.
9.8 Spare parts & consumables
From the SECURED SERVICE menu, (insert the password “DEBUG”),
Select the “Spare parts & consumables”
In this menu is possible to watch the counters of spare parts replaced
and consumables used, managed by software (it is not possible to reset
the counters).
10 Equipment and simulator
The following equipment is required:
ACX SERVICE KIT
•
Oil calibration reference weights
•
Pressure reference gauge
•
fittings for LP/HP coupler
An iron ≥4 kg reference weight is necessary for “gas weight
calibration” (this is not included inside the ACX service kit).
11 Refrigerant fluid circuit
11.1 Refrigerant fluid circuit
For components and circuit layout ref. APPENDIX 1 -
REFRIGERANT FLUID CIRCUIT.